TW201041349A - A method of peer-to-peer transmission with digital rights management - Google Patents

Abstract

A method of Peer-to-Peer (P2P) transmission with Digital Rights Management(DRM) is invented. Its process is to apply the key, to confirm DRM, to store the keys and Rights Expression Languages (RELs), and to transmit the streaming data. Exactly, a provider produces a decryption key to the receiver and updates the encryption key after receiving and confirming the receiver's request and user's identification data. And then, the provider stores the keys and RELs and transmits an encrypted streaming data with DRM by an encryption key to receivers. Thus, the receiver can obtain the streaming data by its decryption key. To be short, this invention patent achieves an objective of P2P transmission with DRM.

Description

201041349 VI. Description of the invention: [Technical field to which the invention pertains] In particular, the present invention is a point-to-point transmission method for point-to-point transmission of bit rights management. [Prior Art] The way in which digital content is shared through the Internet is mainly divided into Server-Client and Peer t〇 Peer (P2p) T-channel technology. The master-slave architecture (4) allows the transfer to adopt a centralized administrative approach. The content requester can only request the connection to the server through the Internet, and the dragon device will transmit the web page data to the (four) device display. @ρ2ρ network technology allows users to directly divide the digital content of each other's knives without using a third party (word server), thus speeding up the speed and frequency of digital content exchange, the use of the network Through this technology, you can get the latest digital information. However, it has an anonymous transmission and reception after the public + & ^ ~ so that the characteristics of the sigh knife but also caused the digital content to be illegally spelled on the Internet *. 〇 scatter, the creator is therefore digital Content production loses confidence. In order to improve the aforementioned non-discrimination, there is a number of rights, and the number of rights management mechanism digital rights management machine chowder / juice system (Μ丨 tal (10) management (DRM) rises. In addition to protecting the digital 3 ray, the DRM mechanism can also facilitate the use of digital content by the user through the authentication function, which not only protects the content provider A ^^ ^ 榷利叼 also assists in the use of digital content. Avoid infringement in unknown circumstances

Macro right is set to. In addition, the DRM mechanism and the ability to supply A are advocated for those who advocate digital intrinsic. f逦 has the right to receive and allocate rights 4 201041349 Nowadays / using the coffee machine to achieve digital content DRM control has been quite common, regardless of the content provided by the DRM feeder to share digital content, the practice is: "- The provider first uploads a digital content and a usage condition to the - DRM server." The drm server is crying. The dust reduction module compresses the digital combination, the money condition and the corresponding control program. &叩砀❹ Ο —2)^ '纟—The recipient wants to obtain the number of digits containing the digits. The product can be authenticated by the identity of the coffee maker. The verified legal recipient, after receiving the digital content, the recipient also starts the control program to mediate the use right to the surface feeding device, and the coffee feeding device passes the control program. Controlling the recipient's right to use. Although there is currently a person who will use the face-care device to manage the use of the 5P2P architecture, the spirit of 1 P2p technology is that digital content can be directly transmitted to any party via the owner. 'There is no need for a third party in the middle', so the intervention of the DRM server will destroy the advantages of the p2p network technology without transmitting through the second party. [Invention content] In order to solve the existing DRM management method used in the p2p architecture, it is necessary to pass the DRM servo. The management of the device, and the loss of the use of the peer-to-peer method, the technology of the third-party transmission is required. The present invention provides a point-to-point transmission method that allows the content provider and the content receiver to have an _authentication mechanism to achieve a reserved point-to-point transmission method. And the advantages of the two certifications 201041349. In conjunction with the aforementioned technical problems and purposes, the present invention provides a point-to-point transmission method for phased management, the steps of which include: 〃 digit request key, a content provider receives a content • The encryption and decryption key request and the user identity data, the content provider provided by the user includes a database mechanism, the database includes a user database and a management library for the digital rights management mechanism. A program software or - independent operation = material ◎ contains - identity authentication module, a gold record management module: Wheelset, a f-capacity decryption module, and - use control module; and Fenjia, . Xuan Nei Valley receiver includes - receiver digital rights management machine and - use control module, the receiving: system to receive content Decryption module; 权~吕理 mechanism includes a number of rights management to confirm the sentence, the module connects the user capital; library 2 = for: through the identity authentication receiver to transmit - make Λ, not the library verification The content is compared to the information stored in the right representation data by the user identity data-content rights representation data: the user legally uses the rights and the person's if the recipient is a Φ right. The inner valley receiver uses the key management module to calculate the update for legal use. ^The inner valley provider requests the (4) to transmit the decryption key to the second: record and calculate the generated-decryption gold to discard the The recipient of the content: the recipient 'instead, the content provides a storage key and rights table', the decryption key and the content: π 3H content provider stores the addition and J indicates the data in the rights representation database; 201041349 string The inner content is transmitted by the content provider: the content encryption module of the content provider encrypts a stream of content data with a key: and encrypts the encrypted inline material and the corresponding content rights information After being compressed, the content is transmitted to the content receiver, and the step of transmitting the content is further included: a step of confirming the validity of the key, the validity of the confirmation is the management of the content provider. The module periodically links the rights representation database to determine whether the decryption amount of the content recipient and the legitimate use right of the user are invalid, and if the judgment result is that the decryption key is invalid, the content provider will be invalid. The decryption key information is removed and recalculated to generate a new encrypted record, and the content encryption module of the data provider encrypts the subsequently transmitted content of the stream using the newly generated encrypted record. Among them, the 6 Haine Valley provider simultaneously receives streaming content data of one of the two content providers for one content receiver. In the streaming content data transmission step, the content is provided to transmit the encrypted and compressed streaming content data to the content receiver in a multicast manner. ° ^ where 'the content recipient receives the encrypted and compressed stream content data, the content receiver uses the 忒 receiver &content; The step includes: decompressing: the content recipient decrypts the recipient content to extract the content rights representation data; determining whether the decryption record exists: the content recipient determines that the content corresponding to the content rights representation material Deciphering the gold loss, when the recipient has the decryption key, the cough content is internally f. The recipient of the Haine Valley takes out the decryption key 7 201041349 The streamed content data, and the step of playing the content, the decrypted stream content data is given (4). According to the present invention, the & +, γ γ Du Neigu provider and the content receiver can perform the streaming content according to the foregoing steps, and the delivery of the content, and the streaming content data you pass through the DR Μ The sentence, 蹲, , |, ΐ子 ～° achieves the technical effect of maintaining the advantages of point-to-point transmission and DRM certification. 1 ❹ ❹ 实施 [Embodiment] ° A schematic diagram of a system architecture of a point-to-point transmission method with digital rights management. The roles participating in the transmission method may include a content provider (Α) and a content receiver (Β), and each user may become the inner valley provider (Α Or the content recipient (8), and the occupant can serve as both a content provider and a content recipient, referred to as a composite role (A1); for the same reason, each content recipient (Β) can also serve as a content provider at the same time. And the content recipient. For example, the composite role (4) can transmit the data to the content receiver (Β) when acting as the content provider (8), and vice versa, the composite role (Α1) can also be The provider (8) receives the data. The parent-content provider (Α) contains a database (c) and a digital rights management mechanism (D), the database (C) contains a user database database, C1) and a right Representation database (rjghts database, ◦2), the user database (C1) and the rights representation database (C2) are used to authenticate the identity of other users connected and identify legal entitlements. The recipient (B) also includes a digital rights management mechanism (D). The digital rights management mechanism (D) of the embodiment includes an identity authentication module (D1), 201041349 - a key management module (D2), and a Content encryption mode π,, 115 m (U3), a content decryption fruit '. and (call and use control module (D5), wherein the digital weight: mechanism (9) may be a user computer serving as a content provider (eight) An application software in the system or a system that operates independently. μ Refer to the figure - which is the participation of peer-to-peer data in this embodiment - as a composite role of content providers (Α1) and content receivers (8) Digital rights tube between Ο Ο And the data transmission step is illustrated, taking the viewpoint of the composite role (Α1) as a main position, and the steps may include: requesting a key (201): the composite role (Α1) accepts the content recipient (Β1) Decryption of the gold material - user identity data. Digital rights management confirmation (202): the composite role (Α1) through the identity 2 certificate module (called the user database (ci) connected to it (4), The non-poor library (C2) verifies that the user identity data transmitted by the content receiver (B) is stored in the rights database (1) 2 in the user identity data comparison - the user's legal use rights And a content rights representation data, wherein the user legally uses the right to regulate the user's rights, such as determining whether the user identity is legal, the user level / usage rights, etc. The content rights representation data defines rules for the use of a stream of data content, such as the corresponding usage rights of users defining each level. For example, the assumption is that the usage level includes the H3 level, where the first level limits the use of the side stream data content 1: the 'level ' is for the user to limit the infinite time within a certain time limit - the person downloads the stream tribute content, etc. The content receiver (8)) is legal for the comparison j, and the composite role (A1) requires the key management module (D2) to be different - the encryption key and the decryption key to be given to the content receiver (B1). Otherwise, the request of the content recipient (B) is discarded. Among them, each of the two receivers 9 201041349 has a dedicated decryption gold wheel, and the compound angle = a mother to decrypt a gold record, or in a certain - decryption tenderness or line update calculation and generate a new encryption gold wheel The regenerated coronation record contains information about the decryption key that was generated last time, or the decryption key that was removed or expired. : Send:: (2. 3), the gold transfer management module of the composite role (A1)) 2_ The deposit is recorded to the content recipient (B1) after the legal authentication. Ο Ο and the right expression (10)): (4) The composite color is stored in the user's decryption record, and the encrypted data is output in the rights representation database (C2). '谷,不贝-模=) 2: Transfer (2. 5): The content of the composite character (A1) plus two == the gold record management module (D2) calculates the encrypted gold input, the right == The content corresponding to the streamed content data is received by the content receiver... The content of the meat 6 & y, 匕3 5 hai number rights management mechanism (D) 哕 二广 module (D4) decryption station Within the received stream, (): Money uses the face _) to play the received stream content data. It is true that the validity of the record is (2 〇 6). — The module (D2) is timed to link the rights table: 2; the decryption key of the user of the Golden Wheel management user of the role (A1) and the entry (C2)' In contrast, whether or not the decryption gun is invalid, the law uses the right to judge each decryption key and defines a loss:; the so-called invalidation can be generated in the interval (indicating the decryption gold...: The failure condition may be - the number of times (indicating that the decryption is only used in the second: = use in the interval) or - the use of the number of times, etc.; if it is judged that the result of the digestive p A is the same as the number of times of the case or the data ° ', If the decryption key fails, the composite character J0 201041349 (A1) recalculates the new encryption key % 'make the encryption key remove the relevant information of the decrypted key that has expired, <after' the composite character (A1) The content encryption module (D3) encrypts the subsequently transmitted S-stream data with the newly generated encryption key of the king, and has a decryption key with a threshold of 40, 2, or expired or expired. The content receiver (B1) can no longer use the original apricot ~ the first solution to decrypt the key to obtain the string Stream content data. Please refer to the third figure, which is the detailed process of the digital rights management confirmation (202) step ❹ ❹ addition, decryption record generation and user legality confirmation, the steps include: gold record requirement (301), verification user Identity (3〇2), determine whether the user is legally authorized (3〇5), generate gold (6), and display an error message (307). The record request (301) is that the composite role_ receives a request for a decryption key from the content receiver (B1); the verification user identity (3〇2) step is performed by the composite role (A) The identity authentication module (D1) function in the digital rights management mechanism (D), the identity authentication module (D1) is first linked to the user database (ci) in cooperation with the content recipient (B1) input Identity information to verify the identity of the content recipient (B" 'where the verification step includes determining whether the user identity is correct (303), comparing the user rights and f material representation data (3〇4). In the step of correct user identity (3〇3), the composite character (A1) first determines whether the identity of the user of the content receiver (B1) is false or not, and then performs the display error message (307) step and ends. If true, the comparison is made to the user rights and data representation data (304) step, wherein the identification = the authenticity of the user's identity is not limited to 'which may be the authentication password of the content recipient (:) , fingerprints, voiceprints, etc., their towels, these passwords Refers to the 201041349 pattern, the voice pattern is stored in the user identity data transmitted to the composite character (Α1) S Xuanbi to the user rights • the role (4)) even ^ right ^ / material "before materials (3Q4) step, the The syllabus indicates that the second slogan = tidal bank (C2) 'takes out the user's role in the user's role. ● The right to use the right to judge the right to make the content of the streamed content 1) Whether it has the required eight readings for use The right holder then begins the execution of the key generation (306) step, which does not match the seat ο end. 〇,] 仃忒 仃忒 不 错误 ( ( ( ( ( ( ( ( 并 并 并 并 307 307 307 307 307 307 307 307 307 307 307 307 307 307 , decrypt the gold record = capacity data transmission (205) steps, please refer to the fifth picture, the composite role: the management module _ received a request from the identity authentication module to start a gold record (4 〇 1) required action , the key management task started: Reverse ¥ Randomly generate the user's individual decryption gold wheel (surgery). · The key management mode

G (D2) firstly generates a lacquer in a random manner according to the requirements of the identity authentication module (D1), said ΓΊ -b, and simultaneously updates the calculation to generate the encrypted record, and stores it on the side. Rights Representation Database (C 2). Calculate the content encryption gun (403): Once the user's decryption record combination changes (the changed status may include: any user leaving, new user, user-user decryption record expired, etc.), The gold record management module P2) will recalculate and generate an encryption key, and perform a transfer encryption (480) step to transmit the add-on content encryption module _ use judgment to decrypt the money period (secret) · 'To ensure that the encryption money is indeed available 12 201041349 'The Jin Yu management module (D2) will be regular _ all w decryption gold wheel ° use! Health (for example, '4 solves the problem of poor gold loss _ preset period, etc.); if the gold record management module (not found that the decryption record expires or expires, then the record management: group _ repeat this step regularly, Conversely, if any user's solution is found: i, expired or expired, then the key management module (call will return to the different content encryption key (403) step. ^ further explain the stream Content data transfer (205) steps, please refer to

Figure 5: After the content of the content receiver (A1) receives the content recipient (calling or other. The inner *receiver of the law (B) - requesting the transmission of content (5.1), perform the following steps: Encrypting the content with the encryption key (502): the content encryption module (D3) of the composite role (A1) encrypts the stream content data that is required to be transmitted by the encryption key. Compressing the encrypted content and the rights representation data (5〇3): The composite character (A1) then obtains the content rights representation data corresponding to the stream content data through its rights representation database (C2). The multicast content (504): The composite role (A1) transmits the encrypted and compressed data to the content receiver (B1) and other legitimate content receivers (B) in a multicast manner (mu|ti_cast). Further illustrates that the received encryption and compression are performed. The streaming content data of the content recipient (B, B1) of the streaming content material is taken out (ie, decrypted), and the sixth picture is taken as the compressed content encrypted and encrypted is transmitted to the content receiver ( B, B1) after the 'contents The person (b, B1) will start the decryption operation with its content decryption module (D4), and the steps include: decompression (602): the content receiver (B, B1) solves the content by itself 13 201041349 i mode And (D 4) first deciphering to extract the content right representation data. Ο 判断 Determine whether there is a corresponding decryption key through the right representation data (1) 〇 4). The far valley receiver (B, B1) then The content right indicates whether the content recipient (B, B1) has the corresponding content rights representation data: the cryptographic record, when the content recipient (B, B1) searches for the corresponding decryption record, then 6 The Xuan Nei Valley receiver (B, B1) performs a decryption content (6〇5) step to retrieve the stream content data, and executes a play content (6〇6) step to play the stream content data; If the content recipient (Day, B1) does not find the corresponding decrypted gold input of the received content right representation data, the content recipient (B'B1) presents the composite role (A1) to - (607) The requirements of the present embodiment. Cup & step by step, please refer to the seventh figure, this embodiment The content control (D5) of the receiver (B, B1) performs the content playback (7〇1) step to play the aforementioned streaming content data for decompression, reduction, and decryption, in order to ensure the content recipient (B) B1) Legitimacy and Sufficiently Obtained Full Use of the Streaming Content Data 'The following steps can be performed while performing content playback (7G1): According to the rights indication data driving authorization (7Q2): Department, receiving for this content The person (B, B1) can continue to legally use the streamed content data according to the content of the decrypted content right. The record use authorization (703): the content receiver (B, B1) uses the control core group (D5) When using the streaming content data, the number and time of using the streaming content data are simultaneously recorded (the time course is because the number of times and/or the time of use of the authorized user of the streaming content data may be subject to _; Lu's streaming content may be a certain online movie of a movie station, which was purchased using 14 201041349 to acquire the movie a & the user has 5 rights to play through the second, therefore, The electricity; Α:: The above steps are shrinking, decrypting..)) After recording the number of times the movie is played "V user's use control module _ remember whether it is about to expire (7〇4 use射射-ΗΠ The content of the receiver (Day, B1) of the 1st control group (D 5) You Gu m compares a 俨..., using the authorization (7〇3) step to record the results than the filial piety and longer restrictions , judge the record surname s π t # 44 # , break. Recorded... If the agreement is not close to the authorization limit, then the ..pp patent condition can be limited by one time limit or one time limit. When the judgment result is yes. ^ ^ Then c Upon request to update the key (705), return to the record authorization (703) step. Request to update Jin Yu (705) · && role (A1m...j) · is the content recipient (B, called to the complex role (A1) transport - update key requirements. Determine whether the gold record request is successful (10)): The content receiver (b, the judgment requesting the update key (7Q5) step of the transmission update Jinyu request is successful, the right key request fails, it will be performed - display the warning "(707) step to = show rights The user is about to expire, and if the content recipient, B1) accepts the request of the content recipient (B, B1) and agrees to give the new gold and update the authorization restrictions, the content recipient (β) , Μ) or authorized to continue/extend the use of the streaming content material, the content recipient (B, B1) returns to the rights representation data driving authorization (702). As described above, the present embodiment generates a decryption key according to the requirements of the newly added content receiver (B) when the composite role (A1) has any change in its content recipient (B, B1). At the same time, the re-update calculation generates an encryption key; the following supplementary explanations show the generation of the encryption key and the decryption key and the manner of encrypting, transmitting and decrypting the streaming content data: 15 201041349 Decryption Golden Wheel Generation: The composite role (A1) Select two prime numbers (p, q) as random numbers for each legal content receiver (B, B1) (hereinafter referred to as a legal member) in random numbers. When the member joins the group, issue the decryption key to A legal member, so each legal member obtains a private decryption key from the composite role (A1) as a member's own private key (p, q). Assume that the composite character (A1) wants to transmit a stream of content material (hereinafter referred to as plaintext message (m)) to each legal member, and the compound role (A1) is again randomized for each legal member. Selecting an operation parameter ("), 〇 and exchanging the plaintext message (m) with the operation parameter (") to obtain an operation result (d). At this time, the plaintext The message (m) has been initially modified to form a secret message parameter (cjpher_text) (", d). The length of the plaintext message (m) must be within the communication range of the length of the private key (p, q). Streaming content data encryption and transmission: the composite role (A1) wants to transmit the stream content data to any or all of the content data receivers (B, B1) according to the foregoing method, and the composite role (A1) is processed. The congruence theorem of the congruence group problem is such as the Chinese Remainder Theory (CRT) or the Indian Remainder Theorem (Aryabhata Rema|_nder)

Theorem 'ART) currently decrypts the decryption key of all legal members and the secret message parameters (r, d), and obtains a security parameter (R' D), the security parameter (R, D) is the plaintext sfl (m) The result of security encryption; finally, the composite role (A1) only needs to broadcast the security parameter (R, D) to each member of the group. The following is a brief description of the calculation process using the Chinese remainder theorem (CRT) as an example: 16 201041349

Step 4: Disclose the R and D messages. Therefore, based on the foregoing, the present embodiment uses the Chinese remainder theorem algorithm (CRT) to encapsulate the encryption key with the encryption key containing all the legal member decryption key information, and obtain the security parameter ( R, D), the composite role (A1) passes this parameter to each legal member. Among them, the screening process of the aforementioned Chinese remainder theorem algorithm must satisfy a modulus theorem, and the calculated safety parameters (R, D) must be less than the length of the private key. If the Indian remainder theorem (Aryabhata Rernainder The〇rem) is adopted, the R and D operations are as follows: R Pl, p2l...; P), D = ART(d1,d2)...; ^1,^2 .·..; Q) 〇R = ART(RM,"2;Pii,pi;Pi) = ART(Q,k"Rii|p;ui; H丨)+"丨, D=ART(Di.1 , d2; qM)P.; q.

Qi) + d ’ i is the serial number of the legal member

Pi; Qi) = ART(0,丨 drRM|qi; Decryption · Every legal member (ie, the recipient of the content (B with his own private and one..., B1)) can benefit

Out of the plaintext message operation, to calculate the secret 岔§fL interest parameter (", 17 201041349 member leaves: when a legal member of the gold" period, the compound role (A1) will leave the member's private = leave, full parameters 吖,, the calculation method and the above-mentioned way (four) new calculation - safety parameters (R,, D,) have been re-counted after ° 'this time' new security ..., because ... ^ there is no private loss of members of the private Even if the leaving member receives the security parameter (R, n, using the original private possession I # θ more,), profit, ... the law cracks the plaintext message (10), where he owns it has not expired or expired,

Ri, u _ in the content of the key (private key)

G (or B1) can also get clear text messages without changing the decryption record. ~Members join: Similar to the way members leave, the difference is in the creation of a new queen > a few days to add new members to the decryption gold. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a system diagram of an embodiment of the present invention. The second figure is a process architecture diagram of an embodiment of the present invention. The third figure is a flow chart of digital rights management confirmation according to an embodiment of the present invention. The fourth figure is a working flow chart of the key management module according to the embodiment of the present invention. The fifth figure is a working flow chart of the content encryption module according to the embodiment of the present invention. The sixth figure is a working flow chart of the content decryption module according to the embodiment of the present invention. The seventh figure is a working flow chart of the use control module according to an embodiment of the present invention. [Explanation of main component symbols] (A) Content provider (A1) composite role (B) (B1) Content receiver 18 201041349 (c) Database (C1) User database (C2) Rights representation database (D) Digital rights management mechanism (D1) identity authentication module (D 2) gold record management module (D3) content encryption module (D4) content decryption module D (D5) use control module

Claims (1)

201041349 VII. Patent application scope: 1 · A digital rights management system: The point-to-point transmission method's step package, ^ request record, department - content provider reception - content access to the gold record request and a user identity Information, wherein: - the content provider includes - the mechanism, the database contains m rhino and a digital rights management library, the digital rights management mechanism is not poor, the basin is self-contained - Independent operation system: , ... identity authentication module, - gold record management module, change group, - content decryption module and - use control module; and inner valley encryption the content receiver contains - and - use control Module, the receiving:: the rights management mechanism to the receiver content decryption module; 11 1 s mechanism includes - the digit rights management is exact, the # Ο module connects the user capital:; library:: = donor Through the identity-receiving recipient's transmission-use; the table does not bear the library verification that the content is stored in the rights representation data/section's the user identity data-content rights representation data The legal use right is: the right 4 inner valley receiver is legal. The method uses the key management module to calculate the update-plus" the inner 4 donor requests the key and transmits the decrypted gold to the local record and the calculation - The decryption gold is the request of the recipient of the content. Μ The content provides the storage key and the rights table ^, the decryption of the gold and the content '' is the content provider's library and the - and - nuclear information In the right representation database; 20 201041349 * String to do the inner valley data transmission: the content is to use the encryption gold to lose a stream of content data == two secret module inside the rent,. T T Knife and will be crowned After the stream, the content recipient corresponding to the content rights indicates that the data is collapsed and transmitted to the pair: the point of the digital rights management mentioned in item 1 of the profit range. 'Hai stream content data transmission The step further includes:::::: effect: the step, the confirmation of the golden balance validity is the "second" content receiving; the S pull group periodically links the right to represent the database, and determines the effect, if the clear m user Whether the legal use rights will be lost will be decrypted If the content fails, the content provider will invalidate the solution - ^ ^ ' and the information is removed and recalculated to generate a new encrypted gold gold transfer, then:: The capacity encryption module adopts the newly generated The encrypted content transmitted by Jia, Jia. The point: two: the special party: the scope of the first ... ... with the digital rights management reception - the second = the second is also - the content receiver is r > One of the streams of content data. 4. If the patent application scope is the third-to-point pass method, the stream content data == the point of the reader will be encrypted and the index of the contraction will be in the 6th and 2nd eves. The content is presented to the content recipient. In the claws, the material is transmitted in a multicast mode. The special transmission: Decrypting the operation, the step comprising: performing the content decryption module by using the content receiver to decrypt the content, and the content recipient decrypting the content by the recipient content decryption module 21 201041349 to extract the content rights representation data; There is the decryption key: the content recipient is in the decryption key corresponding to the content rights representation data, and when the recipient has the decryption key, the content receiver decrypts the stream content data and performs a play The content step will play the streamed content data. 8. Schema: (such as the next page) Ο Judging whether or not the content is encrypted and the string is removed. twenty two